Hi there.
I’m having the same problem. I set everything as you mentioned but it continues without moving up and down.
Then I research some more and found that it does work when you set the Default Land Movement to Flying. The problem with this is that you cannot go back to Walking (when you set that during the game, it just do nothing).
Any idea on this?
Is there anything you need to set to let the Character Movement know the player should be swimming?
Thank you.